package com.swyc.osschat.Test.IOTest.NIO;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * @description TODO
 * @Author: z156940l@outlook.com
 * @className BaseTest
 * @Date: 2023/2/15 16:53
 */
public class BaseTest {

    // 保存客户端连接
    static List<SocketChannel> channelList = new ArrayList<>();

    public static void main(String[] args) throws IOException {
        // 创建NIO ServerSocketChannel，与BIO的ServerSocket类似
        ServerSocketChannel serverSocket = ServerSocketChannel.open();
        serverSocket.socket().bind(new InetSocketAddress(9000));
        // 设置ServerSocketChannel为非阻塞
        serverSocket.configureBlocking(false);
        System.out.println("服务启动成功");

        while (true){
            //非阻塞模式accept方法不会则色，否则会阻塞
            //NIO的非阻塞是由操作系统内部实现的，底层调用了linux的accept函数
            SocketChannel socketChannel = serverSocket.accept();
            if (socketChannel != null){
                // 如果客户端进行连接
                System.out.println("连接成功。");
                // 设置socketChannel为非阻塞
                socketChannel.configureBlocking(false);
                // 保存客户端连接到list中
                channelList.add(socketChannel);
            }

            // 遍历连接进行数据读取
            Iterator<SocketChannel> iterator = channelList.iterator();
            while (iterator.hasNext()){
                SocketChannel sc = iterator.next();
                ByteBuffer byteBuffer = ByteBuffer.allocate(6);
                // 非阻塞模式read方法不会阻塞，否则会阻塞
                int len = sc.read(byteBuffer);
                // 如果有数据就把数据打印出来
                if (len > 0){
                    System.out.println("接收到肖：" + new String(byteBuffer.array()));
                }else if (len == -1){
                    //客户端断开，把socket从集合中去掉
                    iterator.remove();
                    System.out.println("客户端断开连接.");
                }
            }
        }
    }
}
